Optical device for implementing augmented reality

Abstract

In order to provide an optical device for clearly implementing augmented reality provided from a display unit, regardless of a change in a focal point of an outer mirror through which a user views, the present invention comprises: the display unit for emitting an optical beam displaying an image; transparent glass through which external light passes and which forms the path of the optical beam emitted by the display unit; and a pinhole mirror disposed to the glass, and disposed on the path of the optical beam emitted by the display unit, so as to reflect the optical beam emitted by the display unit, wherein the pinhole mirror has a polygonal shape and has an area less than that of the pupil so that an image formed by the optical beam emitted by the display unit overlaps with an image formed by the external light having been transmitted through the glass.

What is claimed is: 
     
       1. An optical device comprising:
 a display unit for irradiating a light beam to display an image; 
 a glass made of a transparent material, wherein external light passes through the glass and the glass defines therein a path of a light beam irradiated from the display unit, 
 wherein the glass includes a first glass, a second glass, and an inclined face interposed therebetween, and 
 wherein the inclined face is inclined toward a pupil; and 
 a plurality of pin-hole mirrors disposed on or in the glass and positioned at a path of the light beam irradiated from the display unit to reflect the light beam irradiated from the display unit, 
 wherein the plurality of pin-hole mirrors have a polygonal shape and have an area smaller than an area of the pupil so that an image formed using the light beam irradiated from the display unit overlaps an image formed using the external light passing through the glass, and 
 wherein the plurality of pin-hole mirrors are arranged in a lattice structure and on the inclined face. 
 
     
     
       2. The device of  claim 1 , wherein the plurality of pin-hole mirrors are arranged along an arc and on the inclined face such that paths of the light beams irradiated from the display unit to the plurality of pin-hole mirrors are identical with each other. 
     
     
       3. The device of  claim 1 , wherein the first glass or the second glass further has a lens face located between the display unit and the pin-hole mirrors to allow paths of the light beams irradiated from the display unit to the plurality of pin-hole mirrors to be identical with each other. 
     
     
       4. The device of  claim 1 , wherein the inclined face is curved in a direction perpendicular to a direction in which the light beam from the display unit is irradiated. 
     
     
       5. The device of  claim 1 , wherein the glass further includes a lens on one face thereof into which the light beam irradiated from the display unit is introduced. 
     
     
       6. The device of  claim 1 , wherein each of the plurality of pin-hole mirrors acts as a pinhole lens mirror to cancel a difference between the paths of the light beams irradiated from the display unit. 
     
     
       7. The device of  claim 1 , wherein the lattice structure has a lattice spacing determined based on a distance from the pin-hole mirror to the pupil, a size of the pupil, and a wavelength of the light beam irradiated from the display unit. 
     
     
       8. The device of  claim 7 , wherein the lattice structure forms a periodic pattern having a reflection angle in a form of HOE (Holographic Optical Element) or DOE (Diffractive Optical Element). 
     
     
       9. The device of  claim 1 , wherein the pin-hole mirror has a long axis length having a positive square root of a product of a focal length and a wavelength of the light beam emitted from the display unit. 
     
     
       10. The device of  claim 1 , wherein the glass has a face through which the external light passes and which is planar or curved. 
     
     
       11. The device of  claim 1 , wherein the device comprises a spectacle frame coupled to the glass to maintain a constant spacing between the glass and the pupil.